Design and implementation of ZigBee wireless sensor and control network system in greenhouse

The cable acquisition and control system of the traditional greenhouse has many disadvantages such as complicated wiring, high cost and lack of accuracy and expansibility. In order to solve those problems, a greenhouse acquisition and control system based on ZigBee wireless sensor network (WSN) is designed in this paper. The ZigBee with temperature sensor DS18B20 and humidity sensor AM2301 is used as the sensor node, the fan and the wet curtain formed as two controller nodes which are respectively connected with the ZigBee module. The coordinator receives environmental data collected by the sensor nodes, and then sends the control commands to the controller nodes after processing and analyzing the data, which changes the execution status of the fan and the wet curtain, so as to adjust temperature and humidity inside the greenhouse, providing suitable growth environment for crops. The experimental results show that the system can realize wireless collection of greenhouse environment data and the control of main equipment in the greenhouse. The greenhouse acquisition and control system based on WSN with low cost and low power consumption has reduced labour intensity, and the data packet loss rate is zero, which is applicable for small greenhouse monitoring and control with good accuracy and scalability.